https://bugs.winehq.org/show_bug.cgi?id=53020
--- Comment #6 from Rafał Mużyło galtgendo@o2.pl --- To correct myself: WaitForMultipleObjectsEx and NtWaitForMultipleObjects parameters differ significantly, so the mentioned negation is actually correct.
Yet, while I haven't delved into the code very deep, wine's server_wait treats NULL timeout as TIMEOUT_INFINITE, which doesn't look like an early return.